Don't worry. I am in the same situation as you. This is my second child. My first pregnancy and this one are running the same. I was one of the lucky ones, I have no signs other than sore breasts and weight gain that I am pregnant.
I know it's hard not too worry. After 2 mc, I actually welcome my nausea, constipation, food aversionservice and sore breasts. I'm 9 weeks today. But a few weeks ago was feeling like you are.